GLSA 200612-19: pam_ldap: Authentication bypass vulnerability

http://security.gentoo.org/

Severity:	low
Title:	pam_ldap: Authentication bypass vulnerability
Date:	12/20/2006
Bugs:	#153916
ID:	200612-19

Synopsis

pam_ldap contains a vulnerability that may allow a remote user with a locked account to gain unauthorized system access.

Background

pam_ldap is a Pluggable Authentication Module which allows authentication against LDAP directories.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
sys-auth/pam_ldap	< 183	>= 183	All supported architectures

Description

Steve Rigler discovered that pam_ldap does not correctly handle "PasswordPolicyResponse" control responses from an LDAP directory. This causes the pam_authenticate() function to always succeed, even if the previous authentication failed.

Impact

A locked user may exploit this vulnerability to bypass the LDAP authentication mechanism, possibly gaining unauthorized access to the system.

Workaround

There is no known workaround at this time.

Resolution

All pam_ldap users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-183"

References

CVE-2006-5170

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200612-19.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.